Determination of the salt concentration of an aqueous solution

Details Determination of the salt concentration of an aqueous solution Determination of the salt concentration of an aqueous solution

G - Physics

01

N

G01N 21/65 (2006.01) G01J 3/44 (2006.01) G01N 33/18 (2006.01) G08B 19/02 (2006.01)

Patent

CA 2740828

A method of determining the concentration of a salt that may be present in a substance containing at least some water, comprising the following steps: a) recording the Raman spectrum of photons scattered by the substance in the wave number range 2500 cm -1 to 4000 cm -1; b) determining, for a given temperature of the substance, two points of said spectrum corresponding to two specific wave numbers; c) calculating the ratio of two magnitudes representative of said points to obtain a measurement ratio; and d) comparing said measurement ratio to a reference chart representative of the concentration of the salt for various temperatures as a function of the concentration of said salt. The method advantageously requires no taking of samples and may be contactless.

Procédé de détermination de Ia concentration d'un sel éventuellement présent dans un produit contenant au moins de l'eau, comprenant les étapes suivantes : a) on enregistre le spectre Raman des photons diffusés par le produit dans une plage de nombres d'onde compris entre 2 500 et 4 000 cm-1; b) on détermine, pour une température donnée du produit, deux points dudit spectre correspondant à deux valeurs spécifiques de nombres d'onde; c) on calcule le rapport de deux grandeurs représentatives desdits points, par quoi on obtient un rapport de mesure; d) on compare ledit rapport de mesure à un abaque de référence représentatif de la concentration du sel pour différentes températures en fonction de la concentration dudit sel. Avantageusement, le procédé ne nécessite pas le prélèvement d'échantillons et peut être sans contact.

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